System Conditions for Reassessment CF Service over SOA path · 2020. 1. 27. · Operation of SOA...
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System Conditions for Reassessment CF Service over SOA path
Transcript of System Conditions for Reassessment CF Service over SOA path · 2020. 1. 27. · Operation of SOA...
System Conditions for Reassessment CF Service over
SOA path
B O N N E V I L L E P O W E R A D M I N I S T R A T I O N
BPA-owned Transmission lines: • Keeler-Allston 500kV Line • Lexington-Ross 230kV Line • St.Helens-Allston 115kV Line • Clatsop 230/115kV Bk
PGE-owned Transmission Lines: • Trojan-St. Marys 230kV Line • Trojan-Rivergate 230kV Line
Pacificorp-owned Transmission Lines: • Merwin-St. Johns 115kV Line • Astoria-Seaside 115kV Line
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South of Allston Path
For Discussion Purposes Only
B O N N E V I L L E P O W E R A D M I N I S T R A T I O N
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Operation of SOA
Developed a real-time dynamic TTC that takes into account several different generation scenarios; if the generation conditions in real-time are favorable, then the real-time dynamic TTC is raised appropriately, not to exceed 3,200MWs.
Hourly TTC Path Posting
For Discussion Purposes Only
B O N N E V I L L E P O W E R A D M I N I S T R A T I O N
80 generation scenarios are studied to generate the table that the improved dynamic TTC uses Not posted on OASIS
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Real-time SOA Dynamic TTC
Clark County Clark County
B O N N E V I L L E P O W E R A D M I N I S T R A T I O N
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Operation of SOA
For Discussion Purposes Only
B O N N E V I L L E P O W E R A D M I N I S T R A T I O N
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Operation of SOA SOA dynamic TTC
Actual SOA flow
For Discussion Purposes Only
https://transmission.bpa.gov/Business/Operations/Paths/default.aspx
B O N N E V I L L E P O W E R A D M I N I S T R A T I O N
High load-center temperatures
Low to no wind High Canadian
imports High SW exports High I-5 generation Normally, not one of these causes high flows; it’s a combination of two or more that cause high flows across SOA. The likelihood of two or more occurring simultaneously is highest during the summer.
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What drives high flow in SOA area?
SOA
SW exports
Canadian imports
For Discussion Purposes Only
Gen
B O N N E V I L L E P O W E R A D M I N I S T R A T I O N
Planned or unplanned outages • Unplanned outage events on SOA become
harder to manage when there is congestion. • If the 500kV line experiences an unplanned
outage, up to 2200 MWs of RAS trips generation to protect the rest of the path elements.
I-5 generation level • Low gen typically causes a lower TTC
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What impacts the TTC across the SOA Path?
B O N N E V I L L E P O W E R A D M I N I S T R A T I O N
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What impact does an outage have on TTC?
• All lines in service system state
For Discussion Purposes Only
B O N N E V I L L E P O W E R A D M I N I S T R A T I O N
OVE
RLO
AD!!!
OV
ER
LOA
D!!!
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What impact does an outage have on TTC?
• A large 500kV Line planned/unplanned outage
For Discussion Purposes Only
B O N N E V I L L E P O W E R A D M I N I S T R A T I O N
Real-time assessments • BPA actions • External actions
–Reliability Coordinator –Another entity such as
an adjacent transmission operator.
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Other Considerations in the SOA Area
For Discussion Purposes Only
B O N N E V I L L E P O W E R A D M I N I S T R A T I O N
The system condition occurs when real-time analysis identifies curtailments on the SOA path to mitigate transmission constraints.
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System Condition(s)
For Discussion Purposes Only
B O N N E V I L L E P O W E R A D M I N I S T R A T I O N
System Conditions CF schedules are tagged as firm 7-F.
When BPA is curtailing on the SOA path to mitigate a transmission constraint, BPA system will treat those schedules as 6-CF for that curtailment. • Lower priority e-tags will be curtailed before 6-CF
tags • 6-CF priority status during a curtailment preserves the
higher priority 7-F transmission rights
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What does this mean?
B O N N E V I L L E P O W E R A D M I N I S T R A T I O N
Even though flows have been increasing over the years, due to operational improvements, BPA has not had to curtail on SOA since 2014.
In addition, historical curtailments were based on system operating limit exceedances under the former SOL methodology.
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Operation of SOA
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2008 2009 2010 2011 2012 2013 2014 2015 2016 2017
# of
tim
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Curtailments on SOA
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B O N N E V I L L E P O W E R A D M I N I S T R A T I O N
Service Attributes Interim SOA Service BPA Standard Practice
Mandatory for previously studied PTP TSRs on SOA − Maintains queue positon & eligible for next cluster study − Customer chooses between System Conditions or Number of Hours − Can convert to Bridge in queue positon
− All network impacts of TSR may be reassessed Subject to Biannual Reassessment
Customer can terminate upon reassessment
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Conditional Firm – Interim vs Standard
For Discussion Purposes Only
B O N N E V I L L E P O W E R A D M I N I S T R A T I O N
Yes
No
Process Flow for Studied TSRs
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Studied TSR
TSR SOA Only?
TSR eligible for CF?
Offer Interim CF
CF accepted
Tender 2018 CSA
Offer non-SOA PEA
Customer signs PEA
Customer retains Reassessment CF
Remove Placeholder TSR from LTFPQ
Continued path to Firm (7F)
No
Yes
Yes
No
Yes
No
Yes
No
Remove TSR from LTFPQ
Customer signs CSA
SOA + non-SOA
